I want to Block Outgoing PSTN & Mobile Calls

Dear All,

Please guide me how to make custom context to implement the outgoing calls for specific Extension,
How to make Custom Context ? for PSTN and Mobile Calls.i am giving our country PSTN and Mobile Digits .
PSTN
CityCode-Phone Number
XXX-XXXXXXX

Mobile
03XX-XXXXXXX

Please tell me how to Access Users Mobile or PSTN or Both or only Local Dialing.

Thanks.